Tatum, 31, says the onscreen nudity helped explain the relationship he has with his wife (RachelMcAdams), who loses her memory in a car crash. "That wasn't gratuitous," he insisted. "That was necessary."

Taking his shirt off was another matter, however. "It was like, 'Do I really need to have my shirt off to take out the garbage while eating a piece of pizza and picking up a cat?' Shirtless? Was that really necessary?"